/* --------------------- Reset Cơ Bản --------------------- */
body {
  font-family: "Arial", sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background-color: #fdfdfd;
  color: #444;
}

/* --------------------- Thanh Điều Hướng (Navbar) --------------------- */
.navbar {
  background-color: #2c3e50;
  padding: 10px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px; /* Thêm padding để tránh khoảng trắng */
}

.navbar .logo {
  width: 45px;
  border-radius: 50%;
  animation: logoPulsing 1.5s infinite; /* Hiệu ứng logo */
  cursor: pointer;
}

.navbar .nav-links {
  display: flex;
  list-style: none;
  gap: 15px;
}

.navbar .nav-links a {
  color: #ecf0f1;
  text-decoration: none;
  font-size: 16px;
  padding: 8px 12px;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.navbar .nav-links a:hover {
  background-color: #34495e;
}
@keyframes logoPulsing {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}

/* --------------------- Footer --------------------- */
footer {
  background-color: #2c3e50;
  color: #ecf0f1;
  padding: 20px 0;
}

.footer-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  gap: 20px;
}

.footer-col {
  flex: 1;
  min-width: 250px;
}

.footer-col h3 {
  margin-bottom: 10px;
  font-size: 18px;
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: #bdc3c7;
  text-decoration: none;
}

.footer-col ul li a:hover {
  color: #ecf0f1;
}

/* --------------------- Trang Index --------------------- */
.index-page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.index-content {
  flex: 1;
  background: url("./img/hinhnen2.jpg") no-repeat center center;
  background-size: contain; /* Hình nền sẽ vừa với kích thước nội dung chính */
  padding: 50px;
  width: 90vw; /* Tăng chiều rộng nội dung chính */
  max-width: 1200px; /* Giới hạn chiều rộng tối đa */
  min-height: calc(100vh - 100px); /* Điều chỉnh chiều cao để không quá nhỏ */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: auto; /* Căn giữa nội dung chính */
}

.index-content h1,
.index-content p {
  background: rgba(255, 255, 255, 0.136); /* Nền mờ giúp chữ dễ đọc hơn */
  padding: 10px;
  border-radius: 8px;
  text-align: center;
}
/* --------------------- Trang About --------------------- */
.about-container {
  display: flex;
  max-width: 1000px;
  margin: 40px auto;
  background-color: #f8f9fa;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.about-container .left {
  flex: 1;
  background-color: #ecf0f1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
}

.about-container .left img {
  width: 80%;
  border-radius: 10px;
}

.about-container .right {
  flex: 2;
  padding: 30px;
}

.about-container .right h2 {
  color: #2c3e50;
  margin-bottom: 10px;
}

.about-container .right p {
  font-size: 15px;
  line-height: 1.6;
  color: #555;
}

/* --------------------- Tabs --------------------- */
.tabs-container {
  margin-top: 20px;
  display: flex;
  justify-content: center;
  background-color: #ecf0f1;
  padding: 10px 0;
}

.tabs-list {
  display: flex;
  list-style: none;
  padding: 0;
}

.tabs-list li {
  margin-right: 10px;
}

.tab-link {
  text-decoration: none;
  font-size: 16px;
  color: #555;
  padding: 8px 12px;
  border-radius: 4px;
  background-color: #dcdde1;
  transition: background-color 0.2s;
}

.tab-link.active {
  background-color: #3498db;
  color: #fff;
}

/* --------------------- Trang Labs --------------------- */
.labs-container {
  max-width: 1000px;
  margin: 20px auto;
  padding: 20px;
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.labs-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.labs-list li a {
  color: #2c3e50;
  text-decoration: none;
  font-size: 16px;
  padding: 8px 12px;
  border-radius: 4px;
  background-color: #ecf0f1;
  transition: background-color 0.2s;
}

.labs-list li a:hover {
  background-color: #bdc3c7;
  color: #fff;
}

/* --------------------- Form Liên Hệ --------------------- */
.contact-form form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.contact-form input,
.contact-form textarea {
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
  outline: none;
}

.contact-form button {
  background-color: #3498db;
  color: white;
  border: none;
  padding: 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.contact-form button:hover {
  background-color: #2980b9;
}